Baracoa, Cuba, in January. Addressing members of Parliament last week, Cuba’s economy minister, Marino Murillo, said the country would have to cut fuel consumption by nearly a third during the second half of the year.CreditThe New York Times

MEXICO CITY — During the economic turmoil of the early 1990s, power cuts in Havana were so routine that residents called the few hours of daily electricity “lightouts.”

Now, grim economic forecasts; the crisis in its patron, Venezuela; and government warnings to save energy have stoked fears among Cubans of a return to the days when they used oil lamps to light their living rooms and walked or bicycled miles to work because there was no gasoline.

Addressing members of Parliament last week, Cuba’s economy minister, Marino Murillo, said the country would have to cut fuel consumption by nearly a third during the second half of the year and reduce state investments and imports. His comments, to a closed session, were published on Saturday by the state news media.

Cuba’s economy grew by just 1 percent in the first half of the year, compared with 4 percent last year, as export income and fuel supply to the island dropped, said Mr. Murillo.

“This has placed us in a tense economic situation,” he said.

Weak oil and nickel prices and a poor sugar harvest have contributed to Cuba’s woes, officials said. Venezuela’s economic agony has led many Cubans to wonder how much longer their oil-rich ally will continue to supply the island with crucial oil — especially if the government of President Nicolás Maduro falls.

Those fears grew last week after Mr. Murillo warned of blackouts and state workers were asked to cut their hours and sharply reduce energy use.

“We all know that it’s Venezuelan oil that keeps the lights on,” said Regina Coyula, a blogger who worked for several years for Cuban state security. “People are convinced that if Maduro falls, there will be blackouts here.”

President Raúl Castro of Cuba acknowledged those fears on Friday but said they were unfounded.

“There is speculation and rumors of an imminent collapse of our economy and a return to the acute phase of the ‘special period,’” Mr. Castro said in speech to Parliament, referring to the 1990s, when Cuba lost billions of dollars’ worth of Soviet subsidies.

“We don’t deny that there may be ill effects,” he added, “but we are in better conditions than we were then to face them.”

Besides, he said, Cuba has “this phenomenal social and political capacity to absorb critical changes.”

Still, some are perturbed at the prospect of power cuts. None of the Havana residents interviewed over the weekend had experienced power outages in their neighborhoods.

In an unusually blunt speech to journalists this month, Karina Marrón González, a deputy director of Granma, the official Communist Party newspaper in Cuba, warned of the risk of protests like those of August 1994, when hundreds of angry Cubans took to the streets of Havana for several hours

“We are creating a perfect storm,” she said, according to a transcript of her speech that was published in various blogs. She added, “Sirs, this country cannot take another ’93, another ’94.”

Herbert Delgado-Rodríguez, 29, an art student, remembered his mother cooking with charcoal in the 1990s.

“I don’t know if it will get to the point where there will be protests in the street,” he said. However, he added, Cubans “won’t tolerate the extreme hardships we faced in the ’90s.”

One worker at a bank said that employees had been told to use air-conditioning for two hours each day and work a half-day. Fuel for office cars had been cut by half, she said. A university professor said that she had been given a fan for her office and told to work at home when possible.

Jose Gonzales, who owns a small cafeteria in downtown Havana, was more sanguine.

“Raúl is simply urging us to cut back on unnecessary consumption, that’s all,” he said, adding that talk of another special period was “just a lot of speculation.”

Not all offices or companies have been affected, and Mr. Murillo said that the idea was to ration energy in some users so that others — homes, tourist facilities and companies — could use as much as they need.

In all, he said, the government aimed to cut electricity usage by 6 percent and fuel by 28 percent in the second half of the year.

Under an agreement signed in 2000, Venezuela supplies Cuba with about 80,000 barrels of oil per day, a deal worth about $1.3 billion, said Jorge Piñon, an energy expert at the University of Texas. In return, Cuba sends thousands of medical and other specialists to Venezuela.

On Friday, Mr. Castro said there had been a “certain contraction” of that oil supply.

How large of a contraction is unclear. Reuters reported last week that shipments of crude to Cuba had fallen 40 percent in the first half of this year. Mr. Piñon said that at least part of the reduction was oil that Venezuela refines in Cuba and then ships out again.

Cuba’s energy problems may also be a product of growing demand on the electricity grid, he said. Electricity consumption has risen dramatically over the past 10 years as Cubans who receive remittances from abroad kept air-conditioners whirring and private restaurants, bars and bed-and-breakfasts added refrigerators and heated food in toaster ovens.

Tourism has soared since the United States and Cuba announced an end to their 50-year standoff in December 2014. The number of visitors rose 13.5 percent in the first four months of 2016 and is likely to rise further when commercial flights from the United States begin this year.

If Venezuela did halt oil exports to Cuba, it would not necessarily precipitate a political crisis, experts and bloggers said.

The United States may offer help in order to prevent instability or a mass exodus of desperate Cubans. The Cuban government might speed reforms and open the door wider to foreign investment, Mr. Entwistle said.

“To extrapolate some dire political consequence is unwise,” said Mr. Entwistle, adding, “There are so many levers that they have to push and pull.”

Keep these in mind as you contemplate the direction of the American government over the past 50 years and especially since the Obama election.

The Goals of Communism

(as read into the congressional record January 10, 1963, from "The Naked Communist" by Cleon Skousen)

1. U.S. acceptance of coexistence as the only alternative to atomic war.

2. U.S. willingness to capitulate in preference to engaging in atomic war.

3. Develop the illusion that total disarmament of the United States would be a demonstration of moral strength.

4. Permit free trade between all nations regardless of Communist affiliation and regardless of whether or not items could be used for war.

5. Extension of long-term loans to Russia and Soviet satellites.

6. Provide American aid to all nations regardless of Communist domination.

7. Grant recognition of Red China. Admission of Red China to the U.N.

8. Set up East and West Germany as separate states in spite of Khrushchev's promise in 1955 to settle the German question by free elections under supervision of the U.N.

9. Prolong the conferences to ban atomic tests because the United States has agreed to suspend tests as long as negotiations are in progress.

10. Allow all Soviet satellites individual representation in the U.N.

11. Promote the U.N. as the only hope for mankind. If its charter is rewritten, demand that it be set up as a one-world government with its own independent armed forces. (Some Communist leaders believe the world can be taken over as easily by the U.N. as by Moscow. Sometimes these two centers compete with each other as they are now doing in the Congo.)

12. Resist any attempt to outlaw the Communist Party.

13. Do away with all loyalty oaths.

14. Continue giving Russia access to the U.S. Patent Office.

15. Capture one or both of the political parties in the United States.

16. Use technical decisions of the courts to weaken basic American institutions by claiming their activities violate civil rights.

17. Get control of the schools. Use them as transmission belts for socialism and current Communist propaganda. Soften the curriculum. Get control of teachers' associations. Put the party line in textbooks.

18. Gain control of all student newspapers.

19. Use student riots to foment public protests against programs or organizations which are under Communist attack.

20. Infiltrate the press. Get control of book-review assignments, editorial writing, policymaking positions.

21. Gain control of key positions in radio, TV, and motion pictures.

22. Continue discrediting American culture by degrading all forms of artistic expression. An American Communist cell was told to "eliminate all good sculpture from parks and buildings, substitute shapeless, awkward and meaningless forms."

27. Infiltrate the churches and replace revealed religion with "social" religion. Discredit the Bible and emphasize the need for intellectual maturity which does not need a "religious crutch."

28. Eliminate prayer or any phase of religious expression in the schools on the ground that it violates the principle of "separation of church and state."

29. Discredit the American Constitution by calling it inadequate, old-fashioned, out of step with modern needs, a hindrance to cooperation between nations on a worldwide basis.

30. Discredit the American Founding Fathers. Present them as selfish aristocrats who had no concern for the "common man."

31. Belittle all forms of American culture and discourage the teaching of American history on the ground that it was only a minor part of the "big picture." Give more emphasis to Russian history since the Communists took over.

32. Support any socialist movement to give centralized control over any part of the culture--education, social agencies, welfare programs, mental health clinics, etc.

33. Eliminate all laws or procedures which interfere with the operation of the Communist apparatus.

34. Eliminate the House Committee on Un-American Activities.

35. Discredit and eventually dismantle the FBI.

36. Infiltrate and gain control of more unions.

37. Infiltrate and gain control of big business.

38. Transfer some of the powers of arrest from the police to social agencies. Treat all behavioral problems as psychiatric disorders which no one but psychiatrists can understand.

39. Dominate the psychiatric profession and use mental health laws as a means of gaining coercive control over those who oppose Communist goals.

40. Discredit the family as an institution. Encourage promiscuity and easy divorce.

41. Emphasize the need to raise children away from the negative influence of parents. Attribute prejudices, mental blocks and retarding of children to suppressive influence of parents.

42. Create the impression that violence and insurrection are legitimate aspects of the American tradition; that students and special-interest groups should rise up and use united force to solve economic, political or social problems.

43. Overthrow all colonial governments before native populations are ready for self-government.

44. Internationalize the Panama Canal.

45. Repeal the Connally reservation so the United States cannot prevent the World Court from seizing jurisdiction over nations and individuals alike.